Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc42e32c791f853…

MALICIOUS

PDF

89.7 KB Created: 2021-04-08 06:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bce7a3d0f90992fda28d7dc14b00b875 SHA-1: 90d1b27aca88fb3341fdfcf2c22fc1d0c8976d4b SHA-256: dfc42e32c791f853158328432ecd688ea30178ed2ddacb351ea3e15b68ddae58
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=how+to+make+nanami+togarashi PDF link annotation
    • https://cdn.sqhk.co/delotijuw/hdIhdjd/chocolate_ice_cream_recipe_with_evaporated_milk.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/aYCij2Q/11707202700.pdfIn PDF document text
    • http://fovagenifozemub.iblogger.org/cellucotton_and_kleenex_worksheet_answers.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/xewusumake.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/meluneniga.pdfIn PDF document text
    • https://sipedevesebin.weebly.com/uploads/1/3/4/8/134879103/6965373144b.pdfIn PDF document text
    • https://zufogeseganoxe.weebly.com/uploads/1/3/0/7/130776657/674d0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijonomun.rf.gd/74943837917.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/giving_directions_useful_expressions_worksheets.pdfIn PDF document text
    • http://jopinewo.epizy.com/66996861789.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_ec5ce586536c4aa9b0c4194ecb64c61b.pdf?index=trueIn PDF document text
    • http://wirobateruku.rf.gd/14839825105.pdfIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_ce45845bbd3b4325844cc21008d04f79.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_e16d5c5d179849929dfda2b38d0545c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/filling_out_personal_allowances_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/notepuxoribaxezomizixe.pdfIn PDF document text
    • http://wazaranugaxexok.rf.gd/cephas_msipa_book.pdfIn PDF document text
    • http://darozux.epizy.com/screenshot_app_for_windows_7_free.pdfIn PDF document text
    • http://fapiruligifujo.epizy.com/categories_of_software.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_44080fdded794344a3fab2acaf931c98.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_2b17bf62366b4f708f422dfa2ce977f7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 5184 bytes
SHA-256: da94df2b148cc7d157a5a37f2c71ad6bbde8239b288f5b69ee9ba9428017ec3c
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 13564 bytes
SHA-256: cb70a136297ce808621dbf6abf90de89993eeec15a6853f6dd5dcf4f08d1e854
font_02_sfnt_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61